/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You under the Apache License, Version 2.0

 * (the "License"); you may not use this file except in compliance with

 * the License.  You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

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package com.sun.org.apache.xalan.internal.xsltc.compiler.util;

import com.sun.org.apache.bcel.internal.generic.ALOAD;

import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;

import com.sun.org.apache.bcel.internal.generic.ILOAD;

import com.sun.org.apache.bcel.internal.generic.ISTORE;

import com.sun.org.apache.bcel.internal.generic.Instruction;

import com.sun.org.apache.bcel.internal.generic.InstructionList;

import com.sun.org.apache.bcel.internal.generic.Type;

/**

 * @author Jacek Ambroziak

 * @author Santiago Pericas-Geertsen

 */

public final class MatchGenerator extends MethodGenerator {

    private static int CURRENT_INDEX = 1;

    private int _iteratorIndex = INVALID_INDEX;

    private final Instruction _iloadCurrent;

    private final Instruction _istoreCurrent;

    private Instruction _aloadDom;

    public MatchGenerator(int access_flags, Type return_type,

                          Type[] arg_types, String[] arg_names,

                          String method_name, String class_name,

                          InstructionList il, ConstantPoolGen cp) {

        super(access_flags, return_type, arg_types, arg_names, method_name,

              class_name, il, cp);

        _iloadCurrent = new ILOAD(CURRENT_INDEX);

        _istoreCurrent = new ISTORE(CURRENT_INDEX);

    }

    public Instruction loadCurrentNode() {

        return _iloadCurrent;

    }

    public Instruction storeCurrentNode() {

        return _istoreCurrent;

    }

    public int getHandlerIndex() {

        return INVALID_INDEX;           // not available

    }

    /**

     * Get index of the register where the DOM is stored.

     */

    public Instruction loadDOM() {

        return _aloadDom;

    }

    /**

     * Set index where the reference to the DOM is stored.

     */

    public void setDomIndex(int domIndex) {

        _aloadDom = new ALOAD(domIndex);

    }

    /**

     * Get index of the register where the current iterator is stored.

     */

    public int getIteratorIndex() {

        return _iteratorIndex;

    }

    /**

     * Set index of the register where the current iterator is stored.

     */

    public void setIteratorIndex(int iteratorIndex) {

        _iteratorIndex = iteratorIndex;

    }

    public int getLocalIndex(String name) {

        if (name.equals("current")) {

            return CURRENT_INDEX;

        }

        return super.getLocalIndex(name);

    }

}